Here is the full list of all 35 Postal III achievements.
Beat game with zero kills.n(zombies and bosses don't count)
Complete game using only the pistol.
Complete game killing only males.
50 badgersaw kills.
Arrest 200 perps.
Kill/incapacitate 235 terrorists.
Complete game using only melee.
Complete Good path without falling off.
Make Venezuela peacemakers go home.
Take out all the criminal scum infesting Catharsis!
Arrest eco zealots leader.
Kill no animals in one playthrough.
Beat the game once. No restrictions apply. Everyone's a winner.
150 kills using fire.
Kill 1000 unarmed bystanders.
Finish your business with Krotchy.
50 kills using cat.
50 kills using boomerang machete.
Destroy 50 cars.
200 kills using M-60.
Escape from prison.
100 kills using machete in melee.
Euthanise 30 elderly folks.
Return Thegways to the owner
50 kills using bees.
Choose path for the first time.
300 headshot/decap kills.
Smash 50 windows.
Taze 200 victims.
Spend 900 seconds or more in catnip bullet time.
Piss 100 gallons of urine.
Respawn 20 times.
Suck up 500 items with the shop vac.
Disobey orders, given to you, and see what happens.
Injure yourself.